CN1199161C - Optical pick up device and optical disc driver - Google Patents
Optical pick up device and optical disc driver Download PDFInfo
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- CN1199161C CN1199161C CNB001088912A CN00108891A CN1199161C CN 1199161 C CN1199161 C CN 1199161C CN B001088912 A CNB001088912 A CN B001088912A CN 00108891 A CN00108891 A CN 00108891A CN 1199161 C CN1199161 C CN 1199161C
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
- G11B7/1275—Two or more lasers having different wavelengths
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/123—Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
- G11B7/131—Arrangement of detectors in a multiple array
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/139—Numerical aperture control means
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13922—Means for controlling the beam wavefront, e.g. for correction of aberration passive
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
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- Optics & Photonics (AREA)
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
An optical disc drive compatible with optical discs of different types, for example, is provided. For focusing, through an optical system used in common with the different types of optical discs, a laser beam emitted from a selected one of a plurality of light sources disposed apart from each other radially of the optical disc, the optical system is moved radially of the optical disc correspondingly to the selection of the light source for emitting the laser light. Namely, it is possible to prevent the optical property from being deteriorated when a single optical pickup is used in common with such optical discs of different types.
Description
Technical field
The present invention relates to a kind of CD drive, more specifically, relate to be applicable to and/or on such as mini disk (CD), digital video disk or digital versatile disc forms such as (DVD) mutually different any CD write the CD drive of data and/or sense data.According to the present invention, a plurality of light sources radially are provided with this CD with being separated from each other, laser is from selected one of them light emitted, this light source is to select according to being installed in facing to the CD on the CD drive of CD, and laser focuses on by the universal optical system that is used for dissimilar CDs.Therefore, single optical pickup apparatus can be common to so a plurality of CDs and not damage optical characteristics.
Background technology
Conventional optical disc drive or CD player be applicable to from the Laser emission of optical pickup apparatus to the information recording surface of CD and handle testing result, to read or to reproduce the various data that are recorded among the CD from the back light on CD surface.
Traditional optical pickup apparatus comprises that a kind of light source and fluorescence detector are the type that is provided with dividually therein, and a kind of type of using the optical integrated device that integrally is made of light source and fluorescence detector.U.S. Patent No. 4,873,429 and No.4,733,067 disclose back one type optical pickup apparatus example of structure.Such optical pickup apparatus can design compactlyer and have higher reliability.
Can think that when using the optical pickup apparatus in the DVD CD drive of this optical integrated device Production Example such as so-called DVD player, DVD player can design compactly and be simple.The DVD player that is designed to write from CD data and/or sense data will be very easy to use.
In this case, light source by will being used for DVD and fluorescence detector and the light source and the fluorescence detector that are used for CD are integrated into an optical integrated device, and the CD player that can write data and/or sense data at CD and DVD can be provided.
When optical integrated device by above-mentioned formation and adopt DVD and during object lens that CD is general, any one of light source that is used for the light source of DVD or is used for CD will depart from the objective lens optical axis setting.The laser beam that goes out from the light emitted that so departs from the optical axis setting will be incident on the object lens obliquely.As a result, the laser beam of oblique incidence will have the aberration of increase and therefore destroy optical characteristics.
As what define in standard, the hole degree of depth in the mini disk (CD) is 1/8th (λ/8) that are transmitted into the laser beam wavelength λ of CD, and the hole degree of depth among the DVD is 1/4th (λ/4) that are transmitted into the laser beam wavelength λ of DVD.Therefore, in DVD player, adopt to be similar to the method that is used for CD to detect tracking error signal be difficult.That is, for instance, tracking error signal has to produce with so-called differential phase detection (DPD) method.In this DPD method, must be provided with to such an extent that the deflection plane of laser beam is parallel to or perpendicular to the direction of scanning of laser beam as the laser diode of light source.
In order effectively to utilize the inner space of optical integrated device, laser diode should be provided with ideally in such a way, promptly makes the deflection plane of laser beam be parallel to or perpendicular to the optical path direction of laser beam.
But, when above-mentioned direction is pointed on the laser-beam deflection plane, will be damaged from the optical characteristics of the read output signal of CD.
Summary of the invention
Therefore, the objective of the invention is, in order to overcome the above-mentioned shortcoming of prior art, a kind of optical pickup apparatus of simple formation is provided, it have a plurality of available light sources with to and/or write data and/or sense data from an optical record medium and do not damage optical characteristics, and a kind of CD drive that adopts this optical pickup apparatus.
According to the present invention, a kind of CD drive is provided, it is applicable to from the CD sense information, its process is to make one of them light emitted laser beam of selecting with being separated from each other and described laser beam is focused on described CD, detects from the back light of described CD reflection and handles the testing result of described back light in a plurality of light sources that described disc radial direction is provided with, and described CD drive comprises:
A universal optical system, the laser beam that is used for described one of them light emitted that will select from described a plurality of light sources is mapped to described CD; With
A mobile device, it is operated in response to the laser beam of selected light source output, on CD, radially to move described optical system all or a part, wherein:
Described a plurality of light source comprises first light source and secondary light source of launching the laser beam of second wavelength of the laser beam of emission first wavelength; And
Described mobile device moves described optical system all or a part by this way, promptly, when from the described first light emitted laser beam, the optical axis of described optical system is consistent with the light path of the described first wavelength laser bundle, and when from described secondary light source emission of lasering beam, the optical axis of described optical system is consistent with the light path of the described second wavelength laser bundle.
Description of drawings
In conjunction with the accompanying drawings preferred embodiment of the present invention is carried out making above-mentioned purpose of the present invention, characteristics and advantage become clearer with following detailed explanation.
Fig. 1 is the synoptic diagram according to CD drive of the present invention;
Fig. 2 is the planimetric map in aperture of the optical pickup apparatus of Fig. 1;
Fig. 3 A and Fig. 3 B are the planimetric map and the sectional views of the optical integrated device in the optical pickup apparatus that is included among Fig. 2;
Fig. 4 is the planimetric map of amplification of light incident surface of the optical integrated device of Fig. 3; With
Fig. 5 explains how light incident surface shown in Figure 4 handles the synoptic diagram of light testing result.
Embodiment
The general structure of (1) embodiment
Now referring to Fig. 1, it schematically expresses an embodiment according to CD drive of the present invention.CD drive is represented with mark 1 usually.Among Fig. 1, show first and second types CD.First CD is the DVD that represents with mark 2A, and second CD is the CD that represents with mark 2B.CD drive 1 playback record is in data on the DVD 2A and the data that are recorded on the CD 2B.Explain for convenience and explanation CD drive 1 that CD 2A and 2B illustrate together in Fig. 1.
CD 2B is such CD, and wherein, emission of lasering beam makes it pass the thick transparent substrate of 1.2mm and arrives the optical disc information recording surface and handle and just can read recorded data from the back light of this information recording surface.DVD 2A is that such CD wherein records the information than the high n double density of CD 2B, and emission of lasering beam makes it pass the thick transparent substrate of 0.6mm and just can read recorded data to big video disc recording surface and processing from the back light of this information recording surface.
In this CD drive 1, make optical pickup apparatus 3 be provided with to such an extent that can on CD, move radially by a predetermined slide mechanism.As shown in fig. 1, optical pickup apparatus 3 is made up of an astigmatic correction plate 50, collimation lens 5, hole 6 and object lens 7.Be mapped to CD 2A or 2B from optical integrated device 4 emitted laser bundles through astigmatic correction plate 50, collimation lens 5, hole 6 and object lens 7.On the contrary, the back light from CD 2A or 2B incides optical integrated device 4 through object lens 7, hole 6, collimation lens 5 and astigmatic correction plate 50.
Optical integrated device 4 is made up of a light source and a fluorescence detector being used for CD and the light source and the fluorescence detector that are used for DVD, and both integrally are arranged in the enclosure.Optical integrated device 4 has two semiconductor laser diode chips that are respectively applied for light source, radially be arranged on CD 2A or 2B each other at a distance of 100 μ m places.According to the CD 2A or the 2B of current use, under the control of system controller (not shown), drive these semiconductor laser diode chips selectively.Therefore, optical integrated device 4 is optionally to the laser beam of CD 2A or 2B emission corresponding to the wavelength of CD 2A or 2B, detected by corresponding fluorescence detector from the back light of CD 2A or 2B.
Astigmatic correction plate 50 is transparent parallel flats, it with respect to the inclined light shaft of laser beam be arranged in the light path of laser beam.Astigmatic correction plate 50 equates laser beam when astigmatism.Select its gradient, thickness etc. so that the astigmatism that can eliminate the laser astigmatism to be provided.Therefore, astigmatic correction plate 50 has been proofreaied and correct the astigmatism of each laser beam that wavelength differs from one another.
Collimation lens 5 will be from optical integrated device 4 emission become to approach parallel light beam with transforming laser by astigmatic correction plate 50.Note, make collimation lens 5 be provided with to such an extent that make the optical axis alignment of its optical axis and DVD laser beam with respect to optical integrated device 4.Therefore, the optical axis and the misalignment of the optical axis of collimation lens 5 and CD laser beam.
As shown in Figure 2, hole 6 is transparent panels that have the dielectric layer that evaporation forms on it, and the heart has a circular open therein.That is to say that hole 6 has the dielectric layer that centers on central opening wherein.Dielectric layer is as light filter, and optionally to block the laser beam of the 780nm wavelength that is used for CD, the laser beam that allows to be used for the 650nm wavelength of DVD is simultaneously passed.Therefore, the incoming laser beam that hole 6 will be used for CD is configured as the light beam with the diameter that depends on opening diameter, and the laser beam that allows simultaneously to be used for DVD is passed hole 6, and its shape does not change at all.Notice that the setting in hole 6 will make that the center of the opening of formation is approached consistent with the optical axis of CD laser beam therein.
Object lens 7 are aspherical plastic lenses that formed by injection molding by a kind of transparent resin.The incident collimated laser beam that the suitable refractive index by selecting transparent resin and the shape of lens surface, formed object lens 7 will be used for DVD or CD focuses on the information recording surface of CD 2A or 2B.Therefore, object lens 7 are formed a so-called bifocal, are respectively applied for the laser beam of DVD and CD.
And a tracking Control regulator 8 that constitutes by the sound coil motor that is directly made progress by CD 2A or 2B can mobile object lens 7, make by come driving regulator 8 to carry out tracking Control corresponding to tracking error signal.
And by a focus control regulator (not shown), object lens 7 are movably along the laser beam optical axis, make to carry out focus control by drive the focus control regulator corresponding to focus error signal.
When the time spent of doing that is not subjected to tracking Control regulator 8, movably object lens 7 will be positioned on the optical axis with DVD laser beam optical axis alignment, simultaneously the optical axis of object lens 7 not with the optical axis alignment of CD laser beam.When reading CD 2B, make object lens 7 corresponding to the space between the light source in the optical integrated device 4 and, prevent that thus the optical characteristics of optical system when reading CD 2B is damaged the moving radially of CD 2B by tracking Control regulator 8.
For tracking Control, CD drive 1 also comprises a servo circuit 10 and driving circuit 11.Servo circuit 10 produces and is used to make tracking error signal TE to reach the drive signal of predetermined level, and driving circuit 11 comes driving regulator 8 according to this drive signal.
As shown in Figure 1, CD drive 1 also comprises an on-off circuit 12.In order to read CD 2B, on-off circuit 12 under the control of system controller with closure, so that a predetermined bucking voltage to be provided to driving circuit 11, driving circuit bucking voltage is provided on the drive signal that is provided by servo circuit 10 successively, and so driving regulator 8.In this CD drive 1, tracking Control is to utilize the object lens 7 that move radially at CD 2B to carry out.
(2) structure of optical integrated device 4
Fig. 3 A is the planimetric map of seeing from the Laser emission direction of optical integrated device 4, and Fig. 3 B is the edge of optical integrated device 4 and the sectional view of the tangent direction of CD 2A or 2B circumference.Prism 14 and the semiconductor laser diode chip 15A on semiconductor chip 17 and 15B are set to form an optical system 16, this optical system 16 is put into enclosure 18 and wiring, and seal this enclosure 18 with clear glass, just constituted optical integrated device 4.
Semiconductor laser diode chip 15A and 15B are provided with at a distance of about 100 μ m towards each other in the footpath of CD 2A or 2B, and launch respectively to prism 14 DVD is the laser beam of 650nm wavelength and is the laser beam of 780nm wavelength to CD.And semiconductor laser diode chip 15A and 15B are provided with is parallel to the plane of reflection or perpendicular to the direction of scanning of the laser in CD 2A or the 2B light incident surface.In addition, the semiconductor laser diode chip 15A of pairing and 15B are closer to each other in equating on astigmatism.They are provided with to such an extent that the section of laser beam is distorted because of astigmatism on identical direction.Therefore, in CD drive 1, single astigmatic correction plate 50 recoverables are from the astigmatism of each laser beam of two light emitted.When reading DVD, tracking error signal is detected by DPD (differential phase detection) method.
Prism 14 is used for laser beam and back light are separated from each other.It forms has one and is generally the rectangular shape that has the inclined-plane on one horizontal side.Therefore, being reflected on the inclined-plane towards the prism 14 of collimation lens 5 from semiconductor laser diode chip 15A or 15B emitted laser bundle, is this inclined-plane that upcountry leads along back light this laser beam light path backpropagation and that be incident on the prism 14.
At prism 14, be incident on the bottom that back light on this inclined-plane will incide prism 14.About 50% back light passes the prism bottom, and remainder is to the reflection of the top of prism 14.The back light that is incident on prism 14 tops there towards the prism bottom with near 100% reflection, and make by the prism bottom.
For the above-mentioned reflection of back light, prism 14 has the mirror surface that is formed by evaporation at its top.And prism 14 has and goes up the branch optical surface that forms in a part of bottom of its prism (hereinafter referred to as " leading flank ") and go up the light transmissive surfaces that forms in the part bottom of its side away from the inclined-plane (hereinafter referred to as " trailing flank "), makes at the back light of the prism bottom that allows to pass the leading flank part and the ratio that allows to pass the amount between the back light of prism bottom of trailing flank part approached 1: 1.Divide optical surface and light transmissive surfaces to form by being similar to the evaporation that forms mirror surface.
Fig. 4 is respectively applied for the planimetric map that the part of the optical detection system that the above-mentioned surface by optical integrated device 4 of CD and DVD constitutes is amplified.For optical integrated device 4, the selection of the size of the direction of semiconductor laser diode chip 15A and 15B and prism 14 will make and form the luminous point that limits by the back light by prism 14 on semiconductor chip 17 when laser beam focuses on just, this luminous point at trailing flank partly is as same focal line (focal line), then as same ellipse, this oval main shaft is perpendicular to the extending direction of focal line on the trailing flank part in the leading flank part.
It is tangent abreast forming common rectangular shape to be used for the light incident surface 25B of CD and 26B and CD circumference, and each is all radially separated by the closing line with the stretching, extension of CD circumference tangent at CD.Therefore, when optical head just on CD during planned orbit, any one of light incident surface 25B and 26B can detect on CD, limit and be the luminous point of the quartern radially.That is, the light testing result of each quartern light incident surface provides as output.Among Fig. 4, represent with mark m and p respectively at the incidence of external light surface portion of leading flank part, and interior lights incidence surface part is represented with mark n and o respectively.Incidence of external light surface portion in the trailing flank part is represented with mark q and t respectively, and interior lights incidence surface part is represented with mark r and s respectively.
The light incident surface 25A and the 26A that are used for DVD are tangent abreast to form common rectangular shape to CD 2A circumference in the mode that is similar to light incident surface 25B and 26B.Light incident surface 26A in the trailing flank part constitutes in the mode that is similar at CD trailing flank light incident surface 26B partly.
Formation and CD leading flank light incident surface 25B partly at leading flank light incident surface 25A partly are similar, and it also tangentially is divided into two with respect to the CD circumference.Therefore, semiconductor chip 17 can produce tracking error signal by so-called differential phase detection (DPD) method.As shown in Figure 4, represent with mark a and d respectively, represent with mark b and c respectively in the inside and the part of the light incident surface under the inclined-plane of leading flank part in outside and the part of the light incident surface on the inclined-plane of leading flank DVD partly.And, represent with mark e and h respectively in the outside and the light incident surface part of leaving the inclined-plane of leading flank part, represent with mark f and g respectively in the inside and the light incident surface part of leaving the inclined-plane of leading flank part.In addition, represent with mark i and l respectively, and represent with mark j and k respectively in the interior lights incidence surface part of trailing flank part at the incidence of external light surface portion of trailing flank part.
When reading CD, the light testing result is handled by following.Before each and between the inside and outside light incident surface part of trailing flank light incident surface 25B and 26B, detect the difference that light detects, between preceding and trailing flank optical surface 25B and 26B, carry out the subtraction between the difference then, to produce a focus error signal by (m+p+r+s)-(n+o+q+t) expression.Before each and between the inside and outside circumference light incident surface of trailing flank light incident surface 25B and the 26B part, detect the difference that light detects, between preceding and trailing flank optical surface 25B and 26B, carry out subtraction between the difference then to produce a tracking error signal of expressing by (m+n+s+t)-(o+p+q+r).Then, will on preceding and trailing flank light incident surface 25B and 26B, all light testing results add together to produce a read output signal of expressing by (m+n+o+p+q+r+s+t).
When reading DVD, according to handling the light testing result, to produce a focus error signal and a read signal of expressing of expressing by (a+b+e+h+j+k)-(b+c+f+g+i+l) by (a+b+c+d+e+f+g+h+i+j+k+l) with the above-mentioned same procedure of reading CD.On the other hand, in order to produce the tracking error signal TE that is used for DVD, by following processing light testing result.As shown in Figure 5, for the every group of light incident surface part that on light incident surface 25A that is set up in parallel and 26A direction, defines, from by adding circuit 42A together to 42D corresponding to the light testing result of two light incident surfaces of the inside and outside periphery of CD 2A.Be every group of amount of determining in the light incident of inside and outside perimeter sides light incident surface part.For any one group, between the group of inside and outside circumferential edge sidelight incidence surface part, carry out the result that the same light of comparing detects by phase- comparison circuit 43A and 43B, add together to produce a tracking error signal TE by adding circuit 44 then.
(3) operation of embodiment
In according to above-mentioned CD drive 1 of constructing with reference to figure 1 describes, optical pickup apparatus 3 emission of lasering beam are to CD 2A or 3B and detect back light from CD, a selected signal processing circuit is handled the testing result of back light, thus from CD 2A or 2B sense information.
More specifically, emission in the optical integrated device 4 of the optical pickup apparatus 3 of laser beam from be combined in CD drive 1, be transformed into approximately parallel light beam by collimation lens 5, pass hole 6, and be directed to laser beam is focused on object lens 7 on CD 2A or the 2B information recording surface.Pass object lens 7 and be incident on the optical integrated device 4 that the back light testing result is provided as output at the back light that produces by laser beam reflection on the information recording surface.
In CD drive 1, tracking error signal TE is produced by above-mentioned processing back light testing result, and object lens 7 are by servo circuit 10 moving radially till tracking error signal TE arrives a prearranged signal level at CD 2A or 2B.That is, carry out tracking Control.Similarly, produce focus error signal, and object lens 7 move up and down up to focus error signal and have a predetermined level.Here it is according to focus control of the present invention.
When the CD in being loaded in CD drive 1 (2A or 2B) is DVD (being 2A), selection be set up in parallel in optical integrated device 4 CD 2A or 2B radially semiconductor laser diode chip 15A and one of them of 15B (see figure 3) be semiconductor laser diode chip 15A to DVD 2A emission of lasering beam, and the back light that detects from DVD 2A through prism 14 by light incident surface 25A that is used for DVD and 26A.
Since optical pickup apparatus 3 be provided with make the optical axis of object lens 7 and collimation lens 5 general with DVD laser beam optical axis alignment, so destruction that can prevent optical characteristics effectively.
On the contrary, when the CD in being loaded in CD drive 1 is CD (being 2B), select semiconductor laser diode chip 15B (see figure 3) to CD 2B emission of lasering beam, pass through the back light that prism 14 detects from CD 2B by light incident surface 25B that is used for CD and 26B.
In CD drive 1, Closing Switch circuit 12 makes to be used for the drive signal that bucking voltage is added to be provided by servo circuit 10 radially object lens 7 being moved a predetermined distance (tracking Control) at CD 2B.Therefore, in CD drive 1, can reduce to destroy to prevent optical characteristics at the aberration of reading to produce during the CD 2B.
The various signals that employing is produced by matrix computations circuit 9 can be observed the destruction of optical characteristics practically.The result who observes demonstrates when object lens 7 are not mobile fully, takes place in tracking error signal TE from the skew of a locational S-characteristic that is used for following the tracks of just.When collimation lens 5 has the focal length of 23mm and the distance between collimation lens 5 and the object lens 7 and is 6.176mm, by object lens 7 are moved the skew that can prevent from the S-feature of lucky tracing positional towards the semiconductor laser diode chip that is used for CD.
The displacement of object lens 7 is proportional to the ratio between the distance between collimation lens 5 focal lengths and collimating mirror 5 and the object lens 7 and changes.By increasing with respect to the collimation lens 5 of collimation lens 5 focal lengths and the distance between the object lens 7, object lens 7 can be removed from the semiconductor laser diode chip that is used for CD, make it possible to prevent the skew from the S-feature of lucky tracing positional.In addition, when the focal length of collimation lens 5 be arranged to equal between collimation lens 5 and the object lens 7 apart from the time, under the situation that does not need mobile object lens 7, might prevent from the skew of the S-feature of lucky tracing positional.Yet, in this case, will be very complicated as the design of the object lens 7 of bifocal.
(4) effect of embodiment
In order to prevent the destruction of the optical characteristics that mobile object lens 7 cause, semiconductor laser diode chip 15A among the present invention and 15B are arranged on CD 2A or 2B radially side by side.Make it possible to use the tracking Control regulator to come easily mobile object lens 7.That is to say,, can design optical pickup apparatus 3 simply to be used for the destruction that mobile object lens 7 prevent optical characteristics according to the present invention.Optical pickup apparatus 3 can be approximate identical with the structure that is used for mini disk.
Notice that the laser beam that is used for CD is focused on mini disk 2B with diameter that is restricted and the numerical aperture that reduces owing to hole 6 thereon.
The back light that is produced by the reflection that is transmitted in the laser on the CD is incident on light incident surface 25A and the 26A that is used for DVD and 25B that is used for CD and 26B (as shown in Figure 4), and the processing from the light testing result of light incident surface 25A and 26B depends on that the CD of being play is 2A or 2B, reads DVD or CD thus.
In above-mentioned CD drive 1, one of them that is chosen on the disc radial direction semiconductor laser diode chip 15A that is provided with and 15B be with emission of lasering beam with being separated from each other, and focus on CD 2A or the 2B by universal optical system (comprising element 5,6 and 7).At this moment, the object lens 7 that constitute the part of optical system move radially on CD, so as with aim at from selected light source institute emitted laser bundle.Therefore, when single optical pickup apparatus 3 is general with a plurality of CDs, might prevent degenerating of optical characteristics.
In aforementioned content, the present invention is illustrated with regard to embodiment.Yet, the present invention is not limited thereto embodiment, but whole optical system all is applicable to movably.
In addition, in CD drive 1 according to the present invention, the astigmatic correction plate made from transparent parallel plane flat board 50 is arranged in the light path of laser beam obliquely, with correction astigmatism from selected one of them light source institute emitted laser bundle when reading CD 2A or 2B.
For astigmatic correction, in CD drive 1, be provided with a pair of on astigmatism equal semiconductor laser diode chip 15A and 15B closer to each other, set-up mode is to make the plane of reflection on the optical disc surface parallel or vertical with the laser beam flying direction, and the cross section of laser beam is owing to astigmatism is being out of shape near on the identical direction.Therefore, single astigmatic correction plate 50 can be common to two laser beam to proofread and correct the astigmatism of each laser beam.Therefore, the simple designs of CD drive 1 has been improved optical characteristics.
As mentioned above, semiconductor laser diode chip 15A and 15B can be arranged in the CD drive 1, so that laser-beam deflection face is parallel or perpendicular to the direction of scanning of laser beam, and the tracking error signal that is used for DVD can be produced by the DPP method.And, because the inner space of optical integrated device 4 can be effectively utilized, make it possible to design compactly this optical integrated device 4.
Because the said structure of CD drive 1, laser beam can be launched from selected one of them the semiconductor laser diode chip that is provided with in disc radial direction with being separated from each other, and focuses on the CD through the universal optical system.In the generation and guiding of this light, can use of the skew of single stigmator with laser beams.Therefore, the simple designs of CD drive 1 will cause the improvement of optical characteristics.
Be described with regard to previous embodiment for the present invention, wherein, transparent parallel flat is as stigmator.Yet the present invention is not limited to this embodiment, and astigmatism can be formed by cylindrical lens, hologram, Fresnel lens etc.When using coupled lens, stigmator can be formed on this coupled lens.
(5) other possible embodiment
In the aforementioned content, the present invention is illustrated with regard to embodiment, wherein, constitutes light incident surface in the optical system that is used for every type of CD.Yet the present invention is not limited to this embodiment, but all or a part of optical system can be constructed to and is common to dissimilar CDs.
The present invention is illustrated with the embodiment of CD and DVD compatibility with regard to being suitable for.Yet the present invention is not limited to this example, but can be applicable to CD with such as CD-R and can write down the mini disk compatibility.
To the present invention just wherein the embodiment of two dissimilar CDs of reading by single optical pickup apparatus be illustrated.Yet the present invention is not limited to this example, but can be applicable to the CD of reading above two types.
With to the present invention just wherein optical pickup apparatus be to be illustrated by the embodiment that the optical integrated device that light source and fluorescence detector integrally constitute constitutes.Yet the present invention is not limited to this example, but can be applicable to and make light source and fluorescence detector be provided with being separated from each other.
As previously mentioned, CD drive according to the present invention be applicable to make when laser beam from a plurality of light sources that are provided with in disc radial direction with being separated from each other selected one of them when launching and when passing through the universal optical system and focusing on the CD, optical system moves with respect to selected light source on disc radial direction, the feasible thus destruction that can prevent optical characteristics when an optical pickup apparatus is common to a plurality of CD.
Have again, according to the present invention, use single stigmator to proofread and correct the skew that surpasses a laser beam, make when one of them of these a plurality of light sources of employing read one of them of these a plurality of optical record mediums, the optical characteristics that the simple structure of CD drive can have been guaranteed to improve.
Claims (7)
1. CD drive, it is applicable to from the CD sense information, its process is to make one of them light emitted laser beam of selecting with being separated from each other and described laser beam is focused on described CD, detects from the back light of described CD reflection and handles the testing result of described back light in a plurality of light sources that described disc radial direction is provided with, and described CD drive comprises:
A universal optical system, the laser beam that is used for described one of them light emitted that will select from described a plurality of light sources is mapped to described CD; With
A mobile device, it is operated in response to the laser beam of selected light source output, on CD, radially to move described optical system all or a part, wherein:
Described a plurality of light source comprises first light source and secondary light source of launching the laser beam of second wavelength of the laser beam of emission first wavelength; And
Described mobile device moves described optical system all or a part by this way, promptly, when from the described first light emitted laser beam, the optical axis of described optical system is consistent with the light path of the described first wavelength laser bundle, and when from described secondary light source emission of lasering beam, the optical axis of described optical system is consistent with the light path of the described second wavelength laser bundle.
2. CD drive according to claim 1 is characterized in that,
Described optical system comprises object lens, is used for described laser beam is focused on an information recording surface of described CD;
Described mobile device is a follow-up control apparatus, is used for controlling described tracking by described object lens are radially moved on described CD; And
Described object lens radially move on CD in response to the laser beam of exporting from selected light source.
3. CD drive according to claim 1 is characterized in that, described a plurality of light sources integrally constitute mutually with the described fluorescence detector that is used for described back light.
4. CD drive according to claim 1 is characterized in that,
Described a plurality of light source comprises first light source and secondary light source of launching the laser beam of second wavelength of the laser beam of emission first wavelength; And
Described mobile device moves described optical system all or a part by this way, promptly when the described first light emitted laser beam, the optical axis of described optical system is consistent with the light path of the laser beam of described first wavelength, when described secondary light source emission of lasering beam, the optical axis of described optical system is consistent with the light path of the laser beam of described second wavelength.
5. CD drive according to claim 4 is characterized in that, described first and second light sources closely are provided with mutually.
6. CD drive according to claim 1 is characterized in that described optical system is removed from the light source of selected emission of lasering beam.
7. CD drive according to claim 4 is characterized in that, it comprises that also one is common to from the stigmator of the laser beam of described first and second light emitted.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP47422/1999 | 1999-02-25 | ||
| JP04742299A JP4013013B2 (en) | 1999-02-25 | 1999-02-25 | Optical disk device |
| JP05541099A JP4126799B2 (en) | 1999-03-03 | 1999-03-03 | Optical disk device |
| JP55410/1999 | 1999-03-03 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101207203A Division CN100347770C (en) | 1999-02-25 | 2000-02-25 | Optical pickup device and optical disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1271160A CN1271160A (en) | 2000-10-25 |
| CN1199161C true CN1199161C (en) | 2005-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101207203A Expired - Fee Related CN100347770C (en) | 1999-02-25 | 2000-02-25 | Optical pickup device and optical disk drive |
| CNB001088912A Expired - Fee Related CN1199161C (en) | 1999-02-25 | 2000-02-25 | Optical pick up device and optical disc driver |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101207203A Expired - Fee Related CN100347770C (en) | 1999-02-25 | 2000-02-25 | Optical pickup device and optical disk drive |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US6657931B1 (en) |
| KR (1) | KR100700118B1 (en) |
| CN (2) | CN100347770C (en) |
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| EP1174865B1 (en) * | 2000-07-22 | 2009-09-30 | Samsung Electronics Co., Ltd. | Compatible optical pickup |
| KR100438274B1 (en) * | 2001-09-12 | 2004-07-02 | 엘지전자 주식회사 | Optical pickup |
| JP3546877B2 (en) * | 2002-05-28 | 2004-07-28 | 三菱電機株式会社 | Semiconductor laser device and optical head device |
| JP4349179B2 (en) * | 2004-03-29 | 2009-10-21 | コニカミノルタオプト株式会社 | Optical element and optical pickup apparatus including the optical element |
| JP2007128579A (en) * | 2005-11-01 | 2007-05-24 | Sharp Corp | Optical pickup device |
| ATE489672T1 (en) * | 2006-09-13 | 2010-12-15 | Koninkl Philips Electronics Nv | DETERMINING THE ALIGNMENT OF AN OBJECT |
| CN104655028B (en) * | 2013-11-22 | 2017-08-22 | 睿励科学仪器（上海）有限公司 | The focusing system and focus method measured for semiconductor chip |
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- 2000-02-23 US US09/511,893 patent/US6657931B1/en not_active Expired - Fee Related
- 2000-02-24 KR KR1020000009061A patent/KR100700118B1/en not_active IP Right Cessation
- 2000-02-25 CN CNB2003101207203A patent/CN100347770C/en not_active Expired - Fee Related
- 2000-02-25 CN CNB001088912A patent/CN1199161C/en not_active Expired - Fee Related
-
2003
- 2003-08-19 US US10/642,758 patent/US7035174B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US7035174B2 (en) | 2006-04-25 |
| CN1516138A (en) | 2004-07-28 |
| KR20000058180A (en) | 2000-09-25 |
| US6657931B1 (en) | 2003-12-02 |
| CN1271160A (en) | 2000-10-25 |
| CN100347770C (en) | 2007-11-07 |
| US20040052172A1 (en) | 2004-03-18 |
| KR100700118B1 (en) | 2007-03-28 |
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